ARO DG051B-7-B Operator's Manual - Page 5

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DISASSEMBLY/ASSEMBLY

INSTRUCTIONS

Never apply excessive

pressure by a holding device which

may cause distortion of a part.

Apply pressure evenly to parts which have a press fit.

Apply even pressure to the bearing race that will be press

fitted to the mating part.

Use

correct tools and fixtures when servicing this

tool.

Don't

damage "0" rings when servicing this tool.

Use only genuine ARO replacement

parts for this tool. When

ordering, specify part number, description, tool model number

and serial number.

GEARING

DISASSEMBLY

Unthread and remove chuck (39) releasing spacer (38).

Clamp tool in a smooth face vise, clamping on handle (5).

Using a wrench on flats of ring gear (32) unthread and remove

ring gear and components.

Remove carrier (28

spindle (31) and gears from ring gear.

NOTE: Keep gears grouped

with with mating spindle when

disassembling

gearing.

Remove lock nut (37), releasing washer (36), bearings (34)

and spacers (33 and 35).

Do not remove gear (29) from carrier (28) unless damage is

evident. Gear (29) is press fit onto carrier.

GEARING

ASSEMBLY

Assemble

spacer (33) and one bearing (34) into ring gear,

pressing on outer race of bearing.

Coat shafts of spindle (31) and carrier (28) with ARO 33153

grease.

Assemble bearings (27) and gears to shafts.

Assemble carrier (28 ) to spindle (31).

Lubricate gears liberally with ARO 33153 grease (see "Rou-

tine Lubrication

Requirements",

page 3).

Assemble gearing into ring gear. Rotate spindle and gears to

align gear teeth with splines of ring gear.

Assemble spacer (35) and bearing (34) into ring gear, press-

ing on inner race of bearing.

Assemble washer (36) into ring gear, securing with lock nut

(37).

Assemble ring gear and components to tool and tighten, using

a wrench on flats of ring gear.

Assemble spacer (38) and chuck (39) to tool.

MOTOR DISASSEMBLY

Remove gearing from tool.

Remove spacer (24) and "0" ring (23)

Tap front edge of housing to remove motor assembly. Locat-

ing pin (25) should also come out.

Grasp cylinder in one hand and tap drive end Of rotor (18) with

a soft face hammer; motor will come apart.

NOTE:

Bearings

are press fit on rotor.

Remove end plate (17) and bearing (16) from rotor.

MOTOR ASSEMBLY

Lubricate bearing (16) with ARO 33153 grease and assemble

to end plate (17) pressing on outer race of bearing.

Assemble end plate (17) to rotor (18) pressing on inner race

of bearing.

Coat five rotor blades (19) with ARO 29665 spindle oil and as-

semble to rotor slots - straight side out.

Coat i.d. of cylinder (20) with ARO 29665 spindle oil and as-

semble over rotor. NOTE: Air inlet slots in end of cylinder must

be aligned with two air inlet holes in end plate (17).

Assemble

bearing (22) to end plate (21) pressing on outer

race of bearing.

Assemble

end plate (21) to rotor, pressing on inner race of

bearing. Be sure rotor turns without binding.

Insert locating pin (25) into .096" diameter blind hole at bottom

of motor cavity in housing.

Align notches of end plates and cylinder and install motor into

housing, aligning notches with locating pin (25).

Lubricate "0" ring (23) and assemble to end plate (21).

Assemble spacer (24) to motor.

Assemble gearing to tool.

THROTTLE

DISASSEMBLY

Remove spirol pin (6), driving it out the left side of housing.

Remove trigger (15), plug (14), valve assembly (13) and "0"

ring (7).

Remove "0" ring (8) valve (9), "0" ring (10) and retaining ring

(11).

Remove inlet adapter (2) and screen (1).

Remove muffler (3) and fillers (4).

THROTTLE

ASSEMBLY

Grease and install "0" ring (7).

Assemble

retaining ring (11) to valve stem (12).

Grease and assemble "0" ring (10) to valve (9).

Assemble valve (9) to valve stem, with smallest diameter of

valve going on valve stem first.

Grease and assemble

"0" ring (8) to valve stem (12).

Assemble valve stem thru plug (14) and assemble plug into

housing (5) aligning

.102" diameter

holes in housing and

plug.

Assemble

trigger (15) to tool, securing with spirol pin (6).

NOTE: Assemble spirol pin from left side of housing.

Assemble fillers (4) and muffler (3) to housing, securing with

inlet adapter (2).

Clean and replace screen (1) in inlet adapter.